https://bugs.webkit.org/show_bug.cgi?id=123895

Reviewed by Darin Adler.

This caching complicates the logic but is used by a single subclass
(HTMLFormControlsCollection) only. The subclass can do the caching itself.

* html/HTMLAllCollection.cpp:
(WebCore::HTMLAllCollection::HTMLAllCollection):
* html/HTMLCollection.cpp:
(WebCore::HTMLCollection::HTMLCollection):
(WebCore::HTMLCollection::create):
(WebCore::HTMLCollection::item):
(WebCore::HTMLCollection::elementBeforeOrAfterCachedElement):
(WebCore::HTMLCollection::firstElement):
        
    Renamed from traverseFirstElement.

(WebCore::HTMLCollection::traverseForwardToOffset):
(WebCore::HTMLCollection::invalidateCache):
        
    Make cache invalidation virtual so we can clear HTMLTableRowsCollection index cache.

(WebCore::HTMLCollection::namedItem):
(WebCore::HTMLCollection::updateNameCache):
        
    Use traverseForwardToOffset instead traverseNextElement. This allows removal of traverseNextElement.

* html/HTMLCollection.h:
(WebCore::HTMLCollection::usesCustomForwardOnlyTraversal):
        
    Renamed the enum and the accessor to be more informative.

(WebCore::HTMLCollection::setCachedElement):
(WebCore::HTMLCollection::customElementAfter):
        
    Renamed from virtualItemAfter.

* html/HTMLFormControlsCollection.cpp:
(WebCore::HTMLFormControlsCollection::HTMLFormControlsCollection):
(WebCore::findFormAssociatedElement):
(WebCore::HTMLFormControlsCollection::customElementAfter):
        
    Move the array position caching logic here.

(WebCore::HTMLFormControlsCollection::invalidateCache):
* html/HTMLFormControlsCollection.h:
* html/HTMLNameCollection.cpp:
(WebCore::HTMLNameCollection::HTMLNameCollection):
* html/HTMLOptionsCollection.cpp:
(WebCore::HTMLOptionsCollection::HTMLOptionsCollection):
* html/HTMLTableRowsCollection.cpp:
(WebCore::HTMLTableRowsCollection::HTMLTableRowsCollection):
(WebCore::HTMLTableRowsCollection::customElementAfter):
* html/HTMLTableRowsCollection.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158758 268f45cc-cd09-0410-ab3c-d52691b4dbfc